Remove unneeded assertions

Author: mhegazy

scripts/tslint/rules/noInOperatorRule.ts

@@ -12,7 +12,7 @@ export class Rule extends Lint.Rules.AbstractRule {
 function walk(ctx: Lint.WalkContext<void>): void {
     ts.forEachChild(ctx.sourceFile, recur);
     function recur(node: ts.Node): void {
-        if (node.kind === ts.SyntaxKind.InKeyword && node.parent!.kind === ts.SyntaxKind.BinaryExpression) {
+        if (node.kind === ts.SyntaxKind.InKeyword && node.parent.kind === ts.SyntaxKind.BinaryExpression) {
             ctx.addFailureAtNode(node, Rule.FAILURE_STRING);
         }
     }

scripts/tslint/rules/noIncrementDecrementRule.ts

@@ -28,7 +28,7 @@ function walk(ctx: Lint.WalkContext<void>): void {
     }
 
     function check(node: ts.UnaryExpression): void {
-        if (!isAllowedLocation(node.parent!)) {
+        if (!isAllowedLocation(node.parent)) {
             ctx.addFailureAtNode(node, Rule.POSTFIX_FAILURE_STRING);
         }
     }
@@ -47,7 +47,7 @@ function isAllowedLocation(node: ts.Node): boolean {
         // Can be in a comma operator in a for statement (`for (let a = 0, b = 10; a < b; a++, b--)`)
         case ts.SyntaxKind.BinaryExpression:
             return (node as ts.BinaryExpression).operatorToken.kind === ts.SyntaxKind.CommaToken &&
-                node.parent!.kind === ts.SyntaxKind.ForStatement;
+                node.parent.kind === ts.SyntaxKind.ForStatement;
 
         default:
             return false;

src/services/documentHighlights.ts

@@ -180,7 +180,7 @@ namespace ts.DocumentHighlights {
                 default:
                     // Don't cross function boundaries.
                     // TODO: GH#20090
-                    return (isFunctionLike(node) && "quit") as false | "quit";
+                    return isFunctionLike(node) && "quit";
             }
         });
     }